Finding the Fourth Proportional to 21,538.28, 29,724.30 and 12,106.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,538.28 : 29,724.30 = 12,106.82 : x
2. Step 2: Convert to fraction form
   21,538.28/29,724.30 = 12,106.82/x
3. Step 3: Cross multiply
   21,538.28x = 29,724.30 × 12,106.82
4. Step 4: Simplify right side
   21,538.28x = 359,866,749.73
5. Step 5: Solve for x
   x = 359,866,749.73/21,538.28
6. Step 6: Final answer
   x = 16,708.24